i have used almost every esun filament except pla since i dont print that ever. i pretty much moved over to esun a year and a half ago. i print alot of it. i keep 3 printers running 16-20 hrs a day. i can say in the 100+ spools i have been through and every plastic type it has all been spot on. i have only had 1 issue with a bulge in the filament but it all prints awesome. i have measured the shrink rates and their stuff has less warp that many others also. i have used many high end filaments also and have found all esun stuff to be just as good or better. all top notch and 1/2 the cost. with that said though, filament in general has come a long way in the past 3 years. 3 years ago there was a ton of junk out there and you really had to watch what you bought. any more finding something that is really bad or junk is few and far between. prices have dropped a ton also.